. The biological role of ribonucleic acids. RNA; Biosynthesis. 112 ROLE OF THE CELL NUCLEUS mination by short-time exposure to distilled water: the nuclei mul- tiply and the cytoplasm divides. Flagellated gametes are produced and escape out of the broken cyst. Copulation of the gametes is quickly followed by the growth of the zygote, which soon differen- tiates into rhizoid and stalk. The whole life cycle takes about 5 months under laboratory conditions and 1 year in nature. adult cap. Zygote ^i^^N 2 days 8 days Fig. 36. Life cycle of Acetabiilaria One of the main results obtain
. The biological role of ribonucleic acids. RNA; Biosynthesis. 112 ROLE OF THE CELL NUCLEUS mination by short-time exposure to distilled water: the nuclei mul- tiply and the cytoplasm divides. Flagellated gametes are produced and escape out of the broken cyst. Copulation of the gametes is quickly followed by the growth of the zygote, which soon differen- tiates into rhizoid and stalk. The whole life cycle takes about 5 months under laboratory conditions and 1 year in nature. adult cap. Zygote ^i^^N 2 days 8 days Fig. 36. Life cycle of Acetabiilaria One of the main results obtained by HammerUng (1934) is the demonstration that unnucleated stalks survive for a very long time (several months). Still more important is the fact that these enu- cleate parts are capable of important regeneration, includmg the formation of large-sized caps (Fig. 37, p. 121). It was concluded by Hammerling, as early as 1934, that the morphogenetic capacity of an enucleate part is determined by the amount of nucleus-dependent morphogenetic substances stored in it; these substances are distrib- uted along an anterio-posterior concentration Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brachet, J. (Jean), 1909-. Amsterdam, New York, Elsevier Pub. Co.
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